Move 'using common::Status;' from common.h to status.h.

include/onnxruntime/core/common/common.h

@@ -42,10 +42,6 @@ namespace onnxruntime {
 
 using TimePoint = std::chrono::high_resolution_clock::time_point;
 
-// Using statements for common classes that we refer to in ONNXRuntime very often.
-// TODO(Task:137) Remove 'using' statements from header files
-using common::Status;
-
 #ifdef _WIN32
 #define ORT_UNUSED_PARAMETER(x) (x)
 #else

include/onnxruntime/core/common/status.h

@@ -188,4 +188,8 @@ inline std::ostream& operator<<(std::ostream& out, const Status& status) {
 }
 
 }  // namespace common
+
+// make Status directly available in the onnxruntime namespace as it is widely used
+using common::Status;
+
 }  // namespace onnxruntime